This little phrase helps most of the guys end an argument or potential squabble. In most cases, they really don't want to actually "talk about it later." They never want to talk about it. Putting off the possibility of a blow up gives them some time to emphasize the uselessness of arguing over something so minute. Although it's a potent tool in a man's arsenal, they need to make sure not to use it too often, or else the underlying motives will become apparent.